import sys
input = sys.stdin.readline

from collections import deque

N,M,K=map(int,input().split())

MAP=[list(map(int,input().split())) for i in range(N)]

OK=0
NG=10**9+1

while NG>OK+1:
    mid=(OK+NG)//2

    DP=[[1<<63]*M for i in range(N)]

    if MAP[0][0]<mid:
        DP[0][0]=1
    else:
        DP[0][0]=0

    Q=deque()
    Q.append((0,0))

    while Q:
        x,y=Q.popleft()

        for z,w in [(x+1,y),(x-1,y),(x,y+1),(x,y-1)]:
            if 0<=z<N and 0<=w<M:
                if MAP[z][w]<mid:
                    if DP[z][w]>DP[x][y]+1:
                        DP[z][w]=DP[x][y]+1
                        Q.append((z,w))
                else:
                    if DP[z][w]>DP[x][y]:
                        DP[z][w]=DP[x][y]
                        Q.appendleft((z,w))

    if DP[-1][-1]<=K:
        OK=mid
    else:
        NG=mid

print(OK)